Using the standard normal curve, the probability or area between z = -1.28 and z = 1.28 is 0.3997.

Name: Using the standard normal curve, the probability or area between z = -1.28 and z = 1.28 is 0.3997.
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Quizplus · Accepted Answer

The area between z = -1.28 and z = 1.28 on the standard normal curve is approximately 0.80 (or 80%), not 0.3997. This range captures the middle 80% of the distribution, indicating that the values within this range are within one standard deviation from the mean in a normal distribution.

Using the Standard Normal Curve, the Probability or Area Between